36 INTRODUCTION. 



Marl — Is a species of clay or loam mixed 

 with lime, and often very suitable for forming- 

 heavy composts. 



Bog^ moss, or peat earth — Is not a diluvial 

 deposit, but an accumulation of decayed vege- 

 table matter, in hollows of stagnant water. 

 This should be very cautiously employed by the 

 florist, and never but as a medium for other 

 qualities, after its own hurtful principles have 

 been dissipated. 



Moor earth — Is that thin turf of fine sand 

 and decayed vegetable matter found on com- 

 mons or waste land where heath usually and 

 naturally grows. This is the favourite soil of a 

 very numerous and beautiful division of plants, 

 and is an indispensable auxiliary of the florist. 

 Where it cannot be conveniently obtained, it 

 may be well imitated by mixing equal parts of 

 fine white sand and leaf mould. 



Leaf mould. — This is composed entirely of 

 rotten leaves, decayed wood, twigs, bark, and 

 other wreck of vegetation. It may be found in 

 old saw-pits, in woods, or procured by collecting 



